I have a few guppies, two male and four female. Sometimes I think the female are pregnant then I separate them into a breeding net. Soon after though they don't appear pregnant any more so I put them back with the others. Now three of the females look pregnant, but I don't know for sure. Is there any way to tell when they are ready to give birth. I have quite a bit of live plant in the tank so the fry would have a place to hide if I didn't isolate them. Does anyone have any suggestions as to what would be the best thing to do? Should I try isolating the females again or just leave them in the tank with the rest?